mac OSBig Sur 11.2 guest user created

I updated to 11.2 on the M1 Mac Mini yesterday. I had to reboot after two attempts to installed failed with an error message that it was unable to download, no internet connection. Yet it had started and I was connected. First time I've seen that with an update on this computer.

Once it installed, the startup screen presented with a Guest User icon log in option. I have never turned this on or had a need for it (I fly solo) It appears the Mac somehow added after the update?